Suffering with joint pain? Millions of Americans suffer with joint pain for a variety of reasons. Sports fatigue, arthritis (关节炎) and aging can all cause wear and tear on your joints ___1___ to discomfort and painful joints. Every single ___2___ your body makes puts pressure on your joints. Up, down, side to side your joints are ___3___ strained.For some people, just moving around results in joint pain. Even people with ___4___ joint pain suffer through activities they once loved. Your joints age over time and like any part of your body, they require regular care and comfort. Many people don't realize how important joint care is, or how to stop joint pain. Some people ___5___ painful joints are just part of life.1.A. assumeB. breakthroughC. constantlyD. determinedE. elementsF. essentiallyG. immediateH. leadingI. marketJ. movementK. occasionalL. promises

本题主要考查词汇在语境中的运用，解题关键在于理解文章上下文的逻辑关系，根据句子所表达的意思来选择合适的词汇。

第1题

• 句子“Sports fatigue, arthritis (关节炎) and aging can all cause wear and tear on your joints __1__ to discomfort and painful joints.”表达的是运动疲劳、关节炎和衰老会对关节造成磨损，进而导致不适和关节疼痛。
• “leading to”是固定短语，意为“导致”，符合此处因果关系的语境，所以应选“leading”。

第2题

• “Every single __2__ your body makes puts pressure on your joints.”这句话描述的是身体做出的每一个动作都会给关节带来压力。
• “movement”表示“动作；运动”，“Every single movement”即“每一个动作”，符合句子逻辑，故填“movement”。

第3题

• “Up, down, side to side your joints are __3__ strained.”描述的是关节在上下、左右等各个方向上的受力情况。
• “constantly”意为“持续地；不断地”，“constantly strained”表示关节持续受压，体现了关节在各种动作中不断受力的状态，所以选“constantly”。

第4题

• “Even people with __4__ joint pain suffer through activities they once loved.”说的是即使是有关节疼痛问题的人，在进行他们曾经喜欢的活动时也会受苦。
• “occasional”表示“偶尔的”，“occasional joint pain”指偶尔的关节疼痛，与后文人们在活动中受苦相呼应，符合语境，因此填“occasional”。

第5题

• “Some people __5__ painful joints are just part of life.”表达的是一些人对关节疼痛的看法。
• “assume”意为“认为；假定”，“Some people assume...”表示一些人认为……，符合此处表达人们观点的语境，所以选“assume”。